Hot air gun



FIG. 1 is a left side elevational view of a hot air gun, showing my new design;

FIG. 2 is a side elevational view showing the right side thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a hot air gun, substantially as shown and described. 